It totally does! lol, because it was blue. If it were white it would have made me think else. I did try to press the entire keyboard and somehow missed it. Good feedback, lemme see if I can try it again now.
So further feedback, you die instantly if you press a color changing button while on the wrong color. So when spamming the keyboard I missed it because I died immediately. So while "exploring" I ended up dying and that plus the initial confusing was difficult.
If I may suggest that the stage 3, where color changing is introduced you instead start on a white platform, it may make it easier to notice that K changes your color (without instant death). As I understand platform games with high restart probability SHOULD have quick death animations to keep things moving, so I understand that part
Another thing I've read is rules of three where introducing new mechanics should come in packs of three since we subconsciously agree with that number. (I.E. white platform, blue, white, red, white yellow, in one stage when being introduced helps people "get it... from what I read, and from then on it's easier to the player because they had three shots of practice).
I tried thinking on how I would do the instructions (blue "k") without making it confusing, but I honestly couldn't think of anything. Turning them white would be silly. (thinking about it). If you could make them on a background (like a sign) or something that might make them stand out as instructions and not collectibles that might help. Maybe I'm the only one who misunderstood. Idunno! Just feedback my dude.